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Hi there! This is my first post at Fossil Forum, hope this information could help in getting some help to identify this fossil.
It was found at a quarry in Vallecillo, Mexico (northeast part, less than 100 kms from Laredo, Texas).
The fossils found here belong to the the Vallecillo member from the Agua Nueva formation, aparently from late Cenomanian to early Turonian.
The full length including the separate vertebrae is aproximately 29 inches or 74 centimeters.
The longest tooth is aproximately 1.4 centimeters long.
I was only able to post a single picture, hope it helps.

Hi,
I found this giant oyster in the Mexican Golf. It weights around 13kgs.
I found this article about something similar, where they did a MRI on the oyster.
- https://www.dailymail.co.uk/sciencetech/article-2154813/amp/The-100-million-year-old-oyster-times-normal-size-undergo-MRI-scan-contains-worlds-biggest-pearl.html
and here the same story with more details, but in spanish
- https://insolitonoticias.com/ostra-fosil-de-145-millones-de-anos-podria-contener-una-perla-gigante/
Cheers.

my son found this at a beach while we were vacationing in Riveria Maya Mexico. we all think it looks like a tooth but it feels like a rock. it's about 4 - 5 inches long (about 12cm).
here are the pictures.

Friends, this time I seek the help of a connoisseur of fossil corals, they are from the Neocomiano (Lower Cretaceous), from a town near Tehuacán, in the State of Puebla (Mexico). The scale is in centimeters. I appreciate your help because although I have dedicated myself to reading the scientific literature of the area, I am an amateur, and many of them are very similar. Of those who have an idea, I put their name for them to say. regards

A new paper regarding toothed mysticetes is available online:
Azucena Solis-Añorve; Gerardo González-Barba; René Hernández-Rivera (2019). "Description of a new toothed mysticete from the Late Oligocene of San Juan de La Costa, B.C.S., México". Journal of South American Earth Sciences. in press. doi:10.1016/j.jsames.2018.11.015.
Niparajacetus is the second Oligocene mysticete to be described from Mexico and the southernmost occurrence of an aetiocetid-like mysticete from the Pacific Coast. I wanted to see if anyone has a copy of the this paper because there's no free access at the website for this paper.

Friends, I seek help to classify them, I have acquired them over the years without any reference. What I have been able to investigate is that they are from the Kimmeridgiano-Portlandian, probably from the formation "cañon of las lajas" (San Luis Potosí, Mexico) .I look for your name and surname.

A new mysticete-related paper is available online:
Hernández Cisneros, Atzcalli Ehécatl. 2018. A new group of late Oligocene mysticetes from México. Palaeontologia Electronica 21.1.7A 1-30. https://doi.org/10.26879/746 palaeo-electronica.org/content/2018/2147-oligocene-mysticetes-from-mexico
The discovery of Tlaxcallicetus represents the second named species of Oligocene chaeomysticete from the eastern Pacific and only the third named species of Paleogene mysticete from that region, the other being the late Eocene Mystacodon from Peru. Thanks to the discovery of Sitsqwayk from Washington State, Tlaxcallicetus shows how much more is to be learned about early chaeomysticete diversity in the Pacific because the vast majority of Pacific chaeomysticetes from the Oligocene have been found in New Zealand (it's possible that there may be an undescribed Oligocene mysticete fossil in museum collections in California, or mysticetes preferred pelagic habitats in California in contrast to the Pyramid Hill odontocetes).